Screw-machine.



No. 842,282. PATBNTED JAN. 29, 1907.

G. T. WARWICK.

SCREW MACHINE.

Armomlon riLnn JULY 16, 1901.

9 SKEETSSHBET 2.

PATENTED JAN. 29, 1907.

G. T. WARWICK. SCREW MACHINE.

APPLIOATIQN FILED JULY 16, 1901.

9 SHEETS-SHEET 3.

*w llllllmi {k iii! S t wan lfoz 'PATENTED JAN. 29, 1907.

G. T. WARWICK. SCREW MACHINE.

APPLICATION FILED JULY 16, 1901.

' 9 sums-sum 4.-

Qwwentoz N0- 842,282. 7 PATENTED JAN. 29, 1907.

I G. T. WARWIG SCREW MACHI APPLICATION FILED JUL PATENTED JAN. 29, 1907.

G. T. WARWICK.

v SCREW-MACHINE. APPLIOATION nun JULY 16, 1901.

9 SHEETS-SHEET 6.

.3 a o Mm & ll o 9? CW aw (Q \m w @RN Hines e0 W41. W

No. 842,282. PATENTED JAN. 29, 1907.

G. T. WARWICK. SCREW MACHINE.

APPLICATION FILED JULYlG, 1901.-

9 SHEETS-SHEET 7.

Fig. 6.

No. 842,282. PATBNTED JAN. 29, 1907. e. T. WARWICK.

sonsw MACHINE.

APPLICATION FILED JULY 16, 1901. 9 SHEETS-SHEET 8.

Fig.6.

1/ 7- 123112 1 1 1.3, F? m 6 7 a mm!!! wg s -zw N 5* I 7f 1 r 7 W c penor ,d/bwacl.

PATENTED JAN. 29, 1907.

G. T. WARWICK.

SCREW MACHINE. APPLICATION FILED JULY 16} 1901.,

9 SEEBTS SHEBT 9.

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1 reduced, as above mentioned, and whereby ducing-rollers having aseriesSTATES, PATENT, onFIo GEORGE TQWARWICK, OF SPRINGFIELD, MASSACHUSETTS.

scasw-mAcl-qme.

Specification of Letters Patent.

- named Jan. 29,1907.

. l Application filed July 16,1901. .Sarial No. 68,557-

jects the provision of a mechanism whereby screw-blanks may be formed ina continuous strip subsequently to be divided in proper lengths andprovided with screw-threads,

which in the thereon. 1 a v My inventionhas, furthermore, for itsobpresent instance are rolled ject' the provision of means' whereby-awire as it may be drawn from a suitable reel will'be gradually reducedindiameterand at certain portions of its length :toform the headportions of the individual blanks, and my invention therefore comprisesa pair of c'oacting reof successively effective working faces wherebythewire is at the same time the blank formingsections are rolled outinto their properlengths.

A further object of my -in'ven-tion may be found in theprovisiofnofjadevice' whereby the wire, or rather the blank-strip, iscut into individual blanks, g I head portion the diameter of which isequal to that-of the wire in its original-form.

My invention has, furthermore, for its object the provision of'aplurality of dies for v that on the :right of said figure the-frame aproperly shaping the head 'ofthe blank and for providing the same ,Witha screw-driver slot, said dies being-successively operative andcomprising in thepresent instance a pair of finishing dies alternatingin theirw-ork upon the blanks.

My invention has, furthermore, for'its ob ject the combination with saiddies of means for holding the blanks during the operation of the dies,these meansconsisting, substantially, of a movable member shiftable intoposition to cooperate with. the dies alternately.

My invention has, furthermore, for it's ob jec't the provisiornof meansfor rolling a screw-thread on the body portion of the blank and incombination'therewithadevice for transferring the blank from the dies tosaid thread-rolling means.

each of which comprises a Further-objects of my invention may be foundin the fparticularconstruction and or ganization o the'sever'al parts,as will be hereinafter described, and pointed out in the claims. v Inthe drawingsfaccompanying this specification and in which similarcharacters denote similar parts, Figure l -in combination with Fig. 1show; a top view of a machine built in accordance with my invention.Figs.

2 and 2 illustrate a side view thereof. 'Figs.-

3 and 3* represent a centrallongitudinal secs tion of my improvedmachine. Fig.- 4 is a face view of one of the pair of reducing-roilers.Fig. 5 shows a section thereof, taken on line A B of Fig. 4. Fig. 6 is avertical crosssection of the machine, taken on lineC D of 'Fig; 1 Fig. 7is a similar section taken on line E F of Fig. 13. Fig. 8 is a sectionof the machine, showing the blank-holder slide and its operatingmechanism. Figs. 9 to 14, inclusive, illustrate the operation, of theheading-dies and also the manner in which the severed blank ispositioned in the holderslide. Figs: 15 to 18, inclusive, are detailviews of the thread-rolling'device, Fig. 15 be-' ing a face view of oneof the rollers, Fig. 16 a top view thereof.- Fig. 17 is an edge viewlooking from the left of Fig. 15, and Fig. 18 is a similar view lookingfrom the right of Fig. 15,and Fig. 19 is a detail of one of thetransferring devices whereby the headed blank is brought into contactwith the thread-rolling mechanism. I

In the, drawings, 0, denotes a suitable frame upon which the variouscomponent parts are's'up orted.

Referring grst to Fig. 1*, it will be seen carries .a series ofWire-straightening rolls '6,

which may be driven in any suitable manner,

and'whence the-wire c is conductedto the feeding means comprising in thepresent instance a'tubular member d, in which the wire is supported andgripped-as, for instance, by a pair of coacting jaws e, pivotally held,as at f, on the tube 11. The jaws e may be operated to grip the wirebymeans of a sleeve 9, the forward end of which is beveled, as at h,while its opposite end is provided with a pair of flanges 'i, adapted toreceive between them a collar 9', diametrically o posite' ends b leveris. This l dveris secured near the end of a shaft 1, j ournaled in abracket m, and carrying at its other end an arm n, having a IOO saidcollar being engaged at a bifurcated roller in engagement with acam-groovmp, which is mounted on a shaft q, dis osed at the side of themachine. The tubu ar feedslide (1 is actuated so as to havealongitudinally-reciprocatory movement in brackets r sas, forinstance,b'y a cam t-betwecn the projections of which are indentationsu, which permit the slide (1 to move for a predetermlned distance fromright to left, the slide being provided near its right end with flanges12, between which is interposed a collar 'w, engaged by abifurcatedlever 0:,mounted upon a shaft g, which is journaled'in bearings 2. Thelever m is operated by means of a link 1, pivoted to said lever 90, asat 2, and carries a roller 3 in engagement with the cam t, abovereferredto, while a spring, such as 4, may be employed for normallymoving the slide (1 from right to left. and thus keep the roller 3 inengagement with the cam t.

As the cam t rotates the lever a; will have imparted to it a vibratorymovement, in this manner subjecting the wire a re eatedly to the actionof a series of successive y-effective working faces of a wire-reducingmechanism, comprisin' in the present instance a pair of rolls 5 an 6,which are substantially alike and'the construction of which is moreparticularly shown in Figs. 4 and 5 of the drawings. Inorder moreclearly to understand "the following description, it should be statedleft of Fig. 3*.

that the objectofthis wire-reducing mechanism is more especially'toreduce only certain pprtions of the wire to form the body'portion o ofthe Wire will be retained to form the-head portion of such blanks, whichin this manner are formed in the shape of a continuous strip of wire,substantially as shown at the The working faces of the wire-reducingroll 5 are indicated herein by the numerals 7, 8, 9, 10, 11, and 12, asshown in Fig. 5,

where it will be seen that thedistance from the center of the roll tothe several working faces is gradually increased, while at the same timethelengths of said working faces are also progressively increased. Itwill now be understood that when the workingface 7 engages the wire 0said wire will be slightly reduced in cross-section and that the portionof the wire outside of the engaging surface 7 will remain in itsoriginal size. As soon as the working face 7 has erformed itsfunctionthe wire 0 is retracted y a rearward movement of the slide d, so thatwhen the roll 5 is rotated to bring the workin'j} face 8 into engagementwith the wire said face 8 the same place longitudinally thereof whichhad been previously acted upon by the working face-7. This sameoperation'is re peated until all of the working faces of the roller5have acted upon the wire,-whereu on the slide (1 may be moved fromright to eft a screw-blank, while the outside diameter sufficiently tosubject another length of wire to the action of the reducing-rolls, or,in

other words, for a full feeding-distance. soon as the last working face12 of the roller 5 is'inengagement with the wire and the latter istherefore firmly held and controlled the jaws e are released from thewire, so that the slide may be retracted, while said wire is left inengagement with the reducin "-roller, and the next forward movement oftieslide (1 will therefore resent a new length of wire to the action oft e reducing mechanism,

Inasmuch as it is evident: that the coaction of the reducing-rollers 5and 6-on -the same length of wire will naturally tend to lengtllen thatportion of the wire, and inasmuch a it should be uniform throu" hout thelen th of dividual working faces from 7 to 12, inclusive, are graduallyincreased proportionately to the re notion of the wire. It will also beunderstoodthat thiscontinued action of the separate working faces on thewire would be liable to produce fins at that point where-the tworeducing-rollers come into contact with the wire and with each other.Forthis reason means are provided whereby the wire is turned axiallyafter each engagement with any one of the working faces, so that if afin the wirewill be turned sufficiently to cause the next set of workinfaces to roll down said fin back into the ody ortion of the wire. Thesemeans consist in the resent instance of a cam 13, actuating a BI 14,which is bifurcated at both endsand one end Fig. 3*) in engagement withear-teeth 16, provided on the (periphery of t e slide (1. In this mannersai slide may be partially rotated to turn the wire in the manner aboveslide is retracted with the wire by the lever an, above referred .to.

The reduci -rollers 5 and 6 are herein shown mounte on spindles 17 and18, respectively, the latter of which is journaled in mounted inbearings 20 mounte for vertical movement in a suitable-framework 21, soas to..allow for-pro per adjustment thereof. The

of the boxes20 is in'engagement with a spindie 22, the outer endof whichprojects through the ca 23 of the frame 21 and is in the upper end saidscrew 22 is provided with a gear 24in constant engagement with teeth 25,formed in a sleeve 26, which constitutes said gear 24 may be turned andthus raise or lower the boxes 20, as will be readily understood. Thesleeve 26 is mounted for rotashould have been formed by one pair'offaces described and during the time when said' spindle- 17 may bevertically adjusted, as is,- for instance, shown in Fig. 3 in which eachscrew-threade engagement therewith. Nearthe hub of a hand-wheel 27', andwhereby is essential that the reduction of the wire the blank to beformed, t e lengths of t e in i ICO of which is provided with'rack-teeth15 (see iro stationary boxes '19, while the s indle 17 is tion on apreferably stationary stud 28, the upper end of which is screw-threadedto receive a hand-nut 29, whereby the sleeve 26 may be. tightenedagainst the cap 23, and thus prevented from displacement.

The spindles 17 and 18 may be caused to rotate together by suitablegears 30, secured thereto, while the spindle 18 carries also a gear 31in en agementwith an intermediate 32, which is driven from a gear 33,mounted upon the shaft 34, as seen in Fig. 2 Also mounted on the spindle18 is a bevel-gear 35 in engagement with another bevel-gear -36, securedto a shaft 37, which is journaied in a bearing 38 and the other end ofwhich carries a gear 39 in engagement with a pinion 40, secured upon theshaft q, above referred to. Fromthis shaft rotary movement is impartedto thecross-shaft 41, which supports the cam t above mentioned as, forinstance, by a pair of miter-gears 42 and 43, secured to the shafts qand 41, respectively. The mechanism thus far described forms what Ipreferably term the blank-strip-- viz., a continuous strand of wirecomposed of reduced portlons interrupted by sections winch are of adiameter corresponding to the "original size of the wire andconstituting the.

heads of the blanks. I will now describe the several parts andmechanisms whereby said strip is dividedinto separate blanks which aresubsequently finished and threaded to form the completed screw.f

Referring especially to Figs. 1 2", 3'9, the

driving mechanlsm comprises a pulley 44,

mounted upon a shaft 45 and carrying a pinion 46 111 engagement with agear .47, which is secured upon a shaft 48, constituting the maindriving-shaft of the machine. Secured on the other end of the shaft 48is a beveled gear 49,- meshing into another beveled gear 50 on a shaft51, which is journaled in bearings 52, secured to or forming a part ofthe framework a. At the right-hand end of the shaft 51 is a beveled gear53, in engagement with another beveled gear 54, which is secured uponthe shaft 34, above mentioned, and from which proper movement isimparted to the blank-strip-forming mechanism previously described.Secured upon the shaft 34 is a cam 55, acting on a 'cam roller 56, whichis ournaled near one end of a lever 57, having its fulcrum at 58intermediate its ends, and on a standard 59, which also serves as amedium for supporting a device for cutting ofl a blank from the strip.The lever 57 is slotted, as at 60, to engage a stud 61, held in a slide62, which is guided in the standard which comprises a pair of sectionswhich are normally c osedas, for instance, by springs 67. (See Fig. 8).Reciprocatory movement maybe imparted to the slide 66 by a cam 68,

mounted upon the shaft 51 and engaging at opposite sides thereof a pairof cam-rollers 69, so that the movement of the slide is at all timesunder perfect control of the cam 68.

Means are provided for seating consecutive blanks in the holder, thesemeans consisting substantially of a slide 70, having a plunger 71 andoperated by a cam 72, in engagement with a-ca'm-roller 73, journaled onthe slide 70.

The 0 eration of seating a blank in one of the hold ers .74 is clearlyshown in Figs. 9 to 11, inclusive, and it will be seen by a comparisonof Figs. 9 and 10 that when the blank 75 is pushed'into the recess 76,formed between the holder-sections 74, the latter will be spread apartand against the action of thesprings 67 and will immediately reclose assoon as the head 77 of the blank will have 9 passed beyond theholder-sections'74 and substantially into position shown in Fig. 11.

Inasmuch as it is essential that the blank should be positioned properlywithin the slide 66, Iprovide thereon projections 66, which serve asmeans against which each placed within the holder 74 a die 78 is movedtoward said holder, so as to indent the head of the blank substantiallyas shown in Fig. 12, and thus practically form what is ordinarily calledthe screwdriver slot" of the blank. The die 78 is mounted upon a slide79, which is mounted for vertical movement in a reciprocatory slide 80,the latter being operated by a cam 81, engaging a roller 82, which isournaled on the slide 80.

As above stated, I employ in the present instance a plurality ofsuccessively-effective dies for shaping the head of the blank, and forthe sake of convenience I deem it preferable to retain the blankstationary within Ioo pair of coperating holder-sections 74 may ITO theholder 74 until the'head has been substanthe second struck by a die 83,also held on the vertically-movable slide 79, above mentioned. For thisreason. the slide 7 9 will be shifted after the first blow has beenblow, the effect of which can be seen in Fig.

13'. From the foregoing'it will be under- }stoodthat the slide 80 movesonce to strike the first blow, whereupon the verticallymovableslide 79will be shifted to'bring the die 83 into position so that the slide 80may now again move forward, and thus strike the second blow with the die83.

The vertical movement of the slide 79 is effeoted' by a cam 84 engaginga cam-roller 85 on a thrust-rod 86, one end. of which is pivotallyattached to an arm 87, secured toa shaft 88, which is journaled in theframe, and the other end of which carries an arm 89, which may beconnected to the slide 79as, for instance, by a link 90.

a After the first two blows have been struck to shape the head of theblank into a condition shown in Fig. 13 the slide 66 may now be shiftedtransversely of the bed, so as to brin the blank into alinement with oneof the mishing-dies 91, (see Fig. 6,) disposed at opposite sides of thepreparatory die and of such shape as to finish the head of the blank,

as shown in Fig. 14.

The distance between the holders 74 in the slide 66 is such that whenone of the holders is in position to receive a blank the other holder ofthe slide will be inalinement with one of the finishing-dies, so that anew blank may be seated in the holder, while at the same time thefinishing-die strikes a blow on the blank in the com anion holder, thisaction taking lace at eit er side of the machine.

The nishing-dies 91 are in the present in stance operated to movesimultaneously, both being mounted on a slide 92, guided in ways 93 atopposite sides of the bed or frame and having proper movement im artedto itas, for instance, by cranks 94, ormed on the shaft 48-while theslide 92 itself serves as a medium of support for the slide 80 of thepreparatory dies and which is held in contact with the operating-camthereofas, for instance, by springs 95 engaging a cross-bar 96,connectedwith the slide 80 in any suitable manner. a

After the blank has been headed and finished into the condition shown inFig. 14 the blank is removed from the holder and deliv--' ered to amechanism whereby said blank is transferred from the holder to thedevice whereby a screw-thread is rolled on the body portion of theblank. The mechanism whereby the blank is removed from the holder anddelivered to the transferring mechanism consists, substantially, of aslide 97, duplicated on the 'otherside of the ma chine and having aroller 98 in engagement with the cam 99, which is mounted u on the shaft34 above mentioned. The orward art of the slide 97 carries a plunger100, the orward end of which is adapted to enter the rear side of theholder 74 in alinement therewith, and thus force the blank forward intoposition to be gripped by the transferring mechanism. This transferringmechanism is also made in duplicate, so that one mechanism iscooperative with each one of the finishing-dies, and it comprises in thepreferred form thereof shown a pair of fingers disposed to engage theblank at diametrically opposite points and substantially in the mannershown in Fig. 6. Mounted on the shaft 51 is a cam 101, having a groove102 for engagin 1 a roller 103, which is journaled on the rod 104. Thisrod is bifurcated at its lower end to straddle the shaft 51,'while at.its upper end it is connected with a lever 105,- pivoted intermediateits ends, as at 106, and the other 'end of which may be connected by alink 107 with one of a pair of vertically-movable slides 108 and 109,the latter of which carries a finger 110. The other slide 108 isprovided with a finger 111, adapted to grip the blank at its upper side,while the finger 110 engages the same at its lower side, the thicknessof the fingers '1 10 1 1 1 being slightly less than the diameter of thebottom diameter of the thread to be rolled. Both slides 108 109 -arefrictionally held in a suitable framework 112 and are mounted in such amanner as to move oppositely to each other and to bring the fingers intoengagement with the blank as soon as the slide 109 commences to rise,this action being caused throu h the intervention of a pinion 113,pivote on a stud 114, which is carried on a slide 115, mounted forvertical movement within the standard 112 and is frictione-d therein sufficiently to counterbalance its own weight and also the tendency ofmovement caused by shifting the slides 108 and109. The particularconstruction of the device is more clearly illustrated in Fig. 19, whichrepresents a longitudinal section of one of the transferring devicescorresponding substantially to the one shown at the right of Fig. 6. Itwill here be seen that the slide 109 has been moved upward until thefinger 110 has engaged the blank at its under slde, while at the sametime the slide 108 was moved during the initial u ward movement of theslide 109 to engage t e blank at its u per side. During the movementthus far escribed the pin ion-slide 1 15 was frictionally heldstationary; but upon a continued upper movement of the slide 109 to theposition shown in Fig. 19 the companion slides 108 and 109 and also thepinion-slide 115 were all moved upward together, both slides 108 and109-being free to move within the slide 115 at the commence- .thread is,as has above been stated, rolled ment of their movement. It will now beunderstood that if the slide 109 should be moved downward through theaction of the camv 101 the slide 115 will, as a matter of course, bestationary, and thereby be effective through the pinion 113 to propelthe slide 108 upward, in this manner separating the finlgers 110 and 111until the pivot-pin 116 come into contact with the top of the slide 115,and thus move all of the three slides downwa-rdtogetherbodily until theyare into position corresponding to that shown to the eft of Fig. 6.

As before stated, the transferring device will carry the headed blankinto engagement with the mechanism for rolling a thread thereon. Thethread-rolling device comprises in the present instance a pair ofrollers, the construction of whichis clearly shown in Figs. 15 to 18,inclu'sive, and'it consists, substantially, of aroll having on theperiphery a series of cooperative sections. whereby the blank ismanipulated and controlled. The

roller is herein designated by the numeral 1 17 and is provided with ablank-reducing section 118, substantially wedge shape and adapted toreduce the body of the blank to the required size, while at the sametime a partial peripheral flange 119 will impart the proper form to theend of the blank. The

into the body of the blank, this function being performed by thethreading-sections 120,

while any lon itudinal movement or displacement of the b ank will beprevented by a pair of coacting guard-flanges 121 and 122, respectively.The threading-rollers are in the present instance continually rotatingand are mounted upon spindles 123 and 124, re spectively, each of whichis journaled in the standard 112 and carries at 'its other end a gear125 in engagement with an intermediate 126, journaled on a stud in theframe 1 12.. It

' will now be seen that when the intermediate 126 is rotated bothcompanion rollers-'1 17 will rotate in the same direction. In thepresent case the threading device is duplicated on the other side of themachine, so as to have one set of threading-rollers cooperate with eachfinishing-die and the transferring mechanism connected therewith, theoperation of the latter being effective also from the cam 1.01 abovereferred to and which also operates a lever 127, the function of whichis similar to the lever 105 above mentioned.

Means are provided for operating both sets of threading rollerssimultaneously, these .means comprising a pair of sprocket-wheels 128,secured to the intermediates 126 and driven by a chain 129 from asprocket-wheel 130, secured upon a shaft 51'above mentioned.

The operation of my improved machine is as follows: A plain wire havinga diameter corresponding to that of the head of the work and a shoulderformed on the wire by' the faces 7 is free to pass by the roller 5 andback into its first position the same length of wire which had beenpreviously acted upon by the face 7 will new a ain be worked by the nextface 8, after which the slide, with the wire, will be a ain retractedand the face '9 will become efiective in reducing and correspondinglyelongating the wire still more.

This? operation is repeated until all ofthe working faces of the roll 5have performed their reducing operations, when the slide (1 will presenta new length of wire to the action of thereducing mechanism. Theblank-strip, which now resembles somewhat that shown at the left of Fig.3", will then be brought under the knife 63, which will sever a blankfrom the strip and position the same in front of one of the holders 74-, whereupon the slide" 70 with its plunger 71 will seat the blank inthe holder, substantially in the manner illustrated in Figs. 9, 10, 11.The die 78 will now strike the first blow, and thus produce the resultshown in Fi 12, whereupon thevertically-movable sli e 79 may be moveddownward, and thus give the die 83 an opportunity of strikin the secondblow, which shapes the head of t e blank substantially asshown in Fig.13. The cross slide 66-is now shifted laterally of the bed and bringsthe blank into position opposite or in alinement with the finishmg-dieat the right-hand side of the machine, where the head is given its finaland finished shape. advance and force the blank out of the holder 7 4and into position to be grip ed by the fingers and 111 of the trans ermechanism, which will shift the blank and hold it between thethreading-rollers during their 0 oration thereon. The threading-rollerswil at first engage the blank with their reducing-sections 118 and thenroll a thread on the blank by the threading-sections 120, after whichthe transferring mechanism will be started downward, and thusrelease theblank, which has now been threaded and is-in the form of a finishedscrew having a round head with a screwdriver slot. Immediately after thetransfer of the blank into alinement with the finishingdie at theright-hand side of the machine the other holder .of the slide 66 willhave been brought into alinement with the plunger-slide 70 and willtherefore be ready to receive a blank, which may thenbe operated upon bythe heading-dies in the same manner as the first blank, so that afterthe first blank has The ejector-slide 97 will now been discharged fromthe crossslide and the injector-slide to the transfer mechanism on.

thatside of the machine. The blank will now be brought into contact withthe duplicate set of threading-rollers, the operation of 5. Thecombination, with a blank-holder, comprising a plurality of movablesections and springs for normally contractin said sections, of meansoperable on one si e of said holder for forcin a headed blank betweenand through the older-sections, and means cooperative with the otherside of said holder and for shaping the head of the severed blank.

6. The combination, with blank-feeding means, a blank-holder, comprisinga pair of movable sections, and means for normally which is similar tothat of the threadingrollers above described.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. The combination, with the biankholder, of a head-shaping die, a pairof finishing-dies disposed at opposite sides thereof, and means forshifting the blank-holder alternately into alinement with thehead-shaping dies and the finishing-dies.

2. The combination, with the head-shap ing die and a pair offinishing-dies, of a blankholder slide, and means for actuatmg saidslide to bring the blank-holder alternately into alinement with saiddies, respectively.

3. The combination,,with 1T eans for feeding a'blank-strip, anintermittently-1rovable slide having a plurality of blank-holders, a

device for cutting off successive blanks from the strip and bringingthem into alinement with said holders, means for removing the blanksfrom the cutting device into said holders, successively, a die forshaping the head of the blank, and means for moving said die intocooperation with one of said holders, of a pair of-finishing-diescooperative with the blank-holders, a reciprocatory slide for supportingsaid finishing-dies, and independent means for actuating both, theblank-holder slide and the die-slide, to bring theblankholders and diessuccessively into alinement, alternately.

4. The combination, with a slide'comprisa blank-holder, and a primaryslide movifie toward and away from the holder, of a secondary slidemovable on the primary slide right angularly to its longitudinalmovement, and havin thereon a slot-forming die, and also ahead-contracting die, means for-moving the primary slide toward and awayfrom tne blank-holder; means for imparting, successively, movement tothe secondary slide, whereby the dies thereon are presented insuccession opposite the blank-holder for therespective operationsthereon, a finishing-die located at a distance from the line of movementof-the double diecarrying slide, means for moving the same toward ,andaway from the blank-holder slide, and means for slidin the blank-holderslide, substantially as an fonthe purposes set forth.

contracting said sections; of abutments for locating said sections normally in alinement with an advancing headed blank, means operable at oneside'of the holder for positioning the blank in alinenient with theholder, a

device for forcing a blank through and be-- tween the holder-sections,and means cooperative with the other side of the holder for shaping thehead of the blank.

7. The combination, with feeding means, and a device for cutting oii' ablank, of a pair of rollers for rolling a thread on the blank, and amechanism for removing the cut-oif blank from the cutting device to thethreading-rollers and for supporting the cut-off blank during the actionof the threadingrollers on the blank.

8. The combination, with feeding means, a 1r echanism for reducing theblank-body, and a device for cutting oil a blank, of a pair ofthreading-rollers having flanges for guiding the head of the blankduring the thread-rolling operation, and a mechanism for removing thecut-off blank from the cutting device, and for positioning thev blankbetween the threading-rollers.

9. The combination, with feeding means, a mechanism for forming a.blank-strip, and a device for cuttin oil a blank, of a pair ofthreading-rollers aving flanges for guiding the head of the blank duringthe thread-roll ing operation, and havin members for 'shap ing the endof the threa ed bl ank-body, and

a mechanism for removing the cut-off blank rrom the cutting device, andfor positioning theblank between the threadin -rollers.

10. The combination, with a lank-holder, of a thread-rolling device, anda mechanism comprising a pair of 'o positely-movable slides, and opposedblan li-engaging fingers carried thereby, me ans for removing the blankfrom the holder into position to be received by the fingers and meansfor actuating said slides and fingers for receivingand transfer ring -aheaded blank from the holder to the thread-rolling device.

1 1. The combination, with a blank-holder, of a threadrolling device, amechanism comprising a pair of oppositely-movable slides, fingerscarried thereby and for receiving and transferring a headed blank fromthe holder to the thread-rolling device, means for moving one of saidslides by the movement of the l of a threadrollin by s'aid fingers. 12.The combination, with a blank-holder,

of threading-rollers, a mechanism comprising.

a pair of oppositely-movable slides carrying fingers for transferring aheaded blank from the holder to the threading-rollers, means forremoving the blank from the holder into position to be'received by thefingers, means for movingone of said slides by the movement of theother, and for causing said fingers to engage the blank, and means forshifting both of the slides, bodily, for bringin said fingers with theblank into position etween the threading-rollers.

13. The combination, with a blank-holder,- and means for removing theblank therefrom, of threading-rollers, a mechanism comprising a pair ofoppositely-movable slides, carrying fingers for transferring a headed.blank from the holder to the threading-rollers, means for moving one ofsaid slides by the movement of the other, and for causing said fingersto en'- gage the blank, means for shifting both slides, together, in onedirection,, to brin the blank into position between the threaing-rollers, and means for shifting the primary slide in the otherdirection to release said fingers from the blank. 14. The combination,with ablank-holder, device, a mechanism for transferrin the b ank fromthe holder to the threading evice, and comprising a pair ofoppositely-movable finger-slides each of which 1s provided withrack-teeth, and a pinion in engagement therewith, and for causing saidslides to move toward each other to engage the blank. 15. Thecombination, with a blank-holder,

of a thread-rolling device, a mechanism for transferring the blank fromthe holder to the oppositely.- movable finger slides each of which isprovided with rack-teeth, and a pinion in engagement therewith andhaving its axis mounted for movement in parallelism with the movement ofsaid slides.

16. The combination, with a blank-holder,

of a thread-rolling device, a 'pair of oppositely-movable finger-slidesfor transferring a blank from the holder to the threading device,

a pinion in engagement with both of said slides and having its axismounted for movement in parallelism with the slide movement,

and means for frictionally retaining said axis in position and forcausing said finger-slides to engage the blank.

17. The combination, with a blank-holder,

of a thread rolling device, a pair of oppositely-movable finger-slides,means for actuating one of said slides to cause both fingerslides toengage the blank at opposite sides threading device, and comprising apair of thereof, and subsequently to move both slides in unison with theblank for transferring the same from the holder to the thread-rollingdevice.

Signed by me at Springfield, Massachusetts, this 22d day of June, 1901.

GEORGE T. WARWICK.

